must tariff
Verbe régulier : tariff - tariffed- tariffed

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must tariff
you must tariff
he must tariff
we must tariff
you must tariff
they must tariff 	I must be tariffing
you must be tariffing
he must be tariffing
we must be tariffing
you must be tariffing
they must be tariffing	I must have tariffed
you must have tariffed
he must have tariffed
we must have tariffed
you must have tariffed
they must have tariffed	I must have been tariffing
you must have been tariffing
he must have been tariffing
we must have been tariffing
you must have been tariffing
they must have been tariffing	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must not tariff
you must not tariff
he must not tariff
we must not tariff
you must not tariff
they must not tariff 	I must not be tariffing
you must not be tariffing
he must not be tariffing
we must not be tariffing
you must not be tariffing
they must not be tariffing	I must not have tariffed
you must not have tariffed
he must not have tariffed
we must not have tariffed
you must not have tariffed
they must not have tariffed	I must not have been tariffing
you must not have been tariffing
he must not have been tariffing
we must not have been tariffing
you must not have been tariffing
they must not have been tariffing	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I tariff?
must you tariff?
must he tariff?
must we tariff?
must you tariff?
must they tariff? 	must I be tariffing?
must you be tariffing?
must he be tariffing?
must we be tariffing?
must you be tariffing?
must they be tariffing? 	must I have tariffed?
must you have tariffed?
must he have tariffed?
must we have tariffed?
must you have tariffed?
must they have tariffed? 	must I have been tariffing?
must you have been tariffing?
must he have been tariffing?
must we have been tariffing?
must you have been tariffing?
must they have been tariffing? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I not tariff?
must you not tariff?
must he not tariff?
must we not tariff?
must you not tariff?
must they not tariff? 	must I not be tariffing?
must you not be tariffing?
must he not be tariffing?
must we not be tariffing?
must you not be tariffing?
must they not be tariffing? 	must I not have tariffed?
must you not have tariffed?
must he not have tariffed?
must we not have tariffed?
must you not have tariffed?
must they not have tariffed? 	must I not have been tariffing?
must you not have been tariffing?
must he not have been tariffing?
must we not have been tariffing?
must you not have been tariffing?
must they not have been tariffing?